Nut-lock.



A. W. HELSING & H. A. DONALDSON.

NUT LOCK.

APPLIUATION TILED DEO.16, 1910. 1 5020, 121 Patented Mar. 19, 1912.

3 W W y WITNESSES I, V flMHelah Mfg/223,212?

AUGUST W. HELSING ANI) HARRY A. DONALIDSON, OF FAIR OAKS. ?ENI TSYLV.AIIIA.

NUT-LOCK;

Specification 01 Letters Patent.

Patented Main l9, 191.2.

Application filed December 16. 1910. Serial No. 5972662.

Tloa/lwimm it may concern: I

tie it known that we, At ous'r lV. llnismu and llannv A. Dom-innsou, citizens the United States of i imerica, residing at Fair Oaks, in the county of ztllegheny and State o't leunsydvania, have invented certain new and uselul Improvements in Nut-Locks, of which the following is a spcciticati 11, reference being had therein to the accompanying drawing.

This invention relates to nut locks, and the objects of the invention are to provide a nut with positive and reliable means in a manner as will be hereinafter set. forth whereby the not when screwed upon a bolt cannot become accidentally displaced, and to provide a nut lock that can be advantageously used in connection with rail joints, bridges, rolling stock and structures sub jected to vibrations that have a tendency to loosen nuts upon bolts.

'ther objects of the invention are to provide a nut lock that can be easily installed in connection with a rail joint witimut the use of skilled labor, and to provide a double loe for a nut upon a bolt.

These and such other objects as may hereinafter appear ate attained by a mecl'ianical construction that will be presentlydescribed in detail and then claimed and reference will now to Figure l is a longitudinal sectional view of the nut lock, lfiig. 2 is a side elevation of the main nut, l ig. 3 is a trout elevation of the same. Fig. 4- is a perimective view of a detached resilient looking n'iem'oer adapted to lorm part of the nut lock Fig; 5 is a rear elevation of a ('letached zuixilizu-y nut, and Fig. (1 is a side ehwation ot' the same.

in the drawing the reference numerals t and denote. by the wof an einmu'de, two pieces ot material provi ed with registering opening-s adap't'er'l to receive a bolt thavion a head 5 to engage thev piece ol material 1. the opposite end of the bolt being screw threaded, as at (t and protruding from the piece of material 9.

7 denotes a nut screwed upon the bolt 4 to engage the outer fare of the piece of material :2 the not 7 having an opening 8 with the walls thereof threaded to receive the threiuled end t' or the bolt 4a The outer face of the nut is provided with an integral tapen inpsleeve 1) having a bore 10 registering had to the drawing, wherein:---

loosely mounted in said socket is the shank it of a resilient flat locking member 1L3. As shown in Fig. 4-, the shank M is circular in cross section so that; with the loose mounting thereof, the member 15 may be moved pivotally in the socket.

]6 denotes an auxiliary nut having an opening 17 with the walls therco't' threaded whereby it can be screwed upon the tailcring sleeve t of the'main nut 7 to contract the split parts of said sleeve. The inner face of the nut ltl has a plurality of tangentially disposed ratchet teeth 'lt and these teeth are adapted to be engaged by the resilient llat locking member 15 to prevent a rearward rotation of the auxiliary nut 16 atter it has been screwed upon the sleeve 9.

'lhe nut lock can be removed without injuring the bolt 4 or the nuts by inserting a suitable instrument between the inner 'lace ot the auxiliary nut 16 and the locking mem ber 15 to pry said device out of engagement. with the tangentially disposed ratchet teeth l8. thus moving the uu-mber pivotal! and releasing the tongue without. placing material pressure on the spring in the dire tion in whi h it exerts pressure. and -as'said lock inn device is held out ot engagement with the auxil ary nut, said out can be loosened with a wrench or other instrument. and then the main nut 7 removed from the bolt.

it is thought that the operation and uiilily ot the nut lock will be apparent without lurthcr description. and while in the drawinn" there is illustrated a prel'crred embodiment ot' the invention, itis to he untlm's-toml that the structural elements thereof are susce'ptiblc to such changes as fall within the scope of the appended claim.

What we claim is:-

In a nut lock a threaded bolt, a nut adapted to be threaded thereon and having an ex tension externally threaded and split longitudinally, a locking member pivotally 2n .=unted in said nut and having a lauei'allyexteniiing spring foiigiie, and an auxiliary nut adapted to be threaded on mid exten hiOIl and 1m ving; teeth adapted to be engaged by said tongue to lock the 11111:, said nuts being disengaged by pivot.

rocking the tongue on its. 

